text: /*
   *  linux/fs/ufs/util.h
   *
   * Copyright (C) 1998 
   * Daniel Pirkl <daniel.pirkl@email.cz>
   * Charles University, Faculty of Mathematics and Physics
   */
  
  #include <linux/buffer_head.h>
  #include <linux/fs.h>
  #include "swab.h"
  
  
  /*
   * some useful macros
   */
  #define in_range(b,first,len)	((b)>=(first)&&(b)<(first)+(len))
  
  /*
   * functions used for retyping
   */
  static inline struct ufs_buffer_head *UCPI_UBH(struct ufs_cg_private_info *cpi)
  {
  	return &cpi->c_ubh;
  }
  static inline struct ufs_buffer_head *USPI_UBH(struct ufs_sb_private_info *spi)
  {
  	return &spi->s_ubh;
  }
  
  
  
  /*
   * macros used for accessing structures
   */
  static inline s32
  ufs_get_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
  		 struct ufs_super_block_third *usb3)
  {
  	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
  	case UFS_ST_SUNOS:
  		if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT)
  			return fs32_to_cpu(sb, usb1->fs_u0.fs_sun.fs_state);
  		/* Fall Through to UFS_ST_SUN */
  	case UFS_ST_SUN:
  		return fs32_to_cpu(sb, usb3->fs_un2.fs_sun.fs_state);
  	case UFS_ST_SUNx86:
  		return fs32_to_cpu(sb, usb1->fs_u1.fs_sunx86.fs_state);
  	case UFS_ST_44BSD:
  	default:
  		return fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_state);
  	}
  }
  
  static inline void
  ufs_set_fs_state(struct super_block *sb, struct ufs_super_block_first *usb1,
  		 struct ufs_super_block_third *usb3, s32 value)
  {
  	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
  	case UFS_ST_SUNOS:
  		if (fs32_to_cpu(sb, usb3->fs_postblformat) == UFS_42POSTBLFMT) {
  			usb1->fs_u0.fs_sun.fs_state = cpu_to_fs32(sb, value);
  			break;
  		}
  		/* Fall Through to UFS_ST_SUN */
  	case UFS_ST_SUN:
  		usb3->fs_un2.fs_sun.fs_state = cpu_to_fs32(sb, value);
  		break;
  	case UFS_ST_SUNx86:
  		usb1->fs_u1.fs_sunx86.fs_state = cpu_to_fs32(sb, value);
  		break;
  	case UFS_ST_44BSD:
  		usb3->fs_un2.fs_44.fs_state = cpu_to_fs32(sb, value);
  		break;
  	}
  }
  
  static inline u32
  ufs_get_fs_npsect(struct super_block *sb, struct ufs_super_block_first *usb1,
  		  struct ufs_super_block_third *usb3)
  {
  	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
  		return fs32_to_cpu(sb, usb3->fs_un2.fs_sunx86.fs_npsect);
  	else
  		return fs32_to_cpu(sb, usb1->fs_u1.fs_sun.fs_npsect);
  }
  
  static inline u64
  ufs_get_fs_qbmask(struct super_block *sb, struct ufs_super_block_third *usb3)
  {
  	__fs64 tmp;
  
  	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
  	case UFS_ST_SUNOS:
  	case UFS_ST_SUN:
  		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qbmask[0];
  		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qbmask[1];
  		break;
  	case UFS_ST_SUNx86:
  		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qbmask[0];
  		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qbmask[1];
  		break;
  	case UFS_ST_44BSD:
  		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qbmask[0];
  		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qbmask[1];
  		break;
  	}
  
  	return fs64_to_cpu(sb, tmp);
  }
  
  static inline u64
  ufs_get_fs_qfmask(struct super_block *sb, struct ufs_super_block_third *usb3)
  {
  	__fs64 tmp;
  
  	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
  	case UFS_ST_SUNOS:
  	case UFS_ST_SUN:
  		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sun.fs_qfmask[0];
  		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sun.fs_qfmask[1];
  		break;
  	case UFS_ST_SUNx86:
  		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_sunx86.fs_qfmask[0];
  		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_sunx86.fs_qfmask[1];
  		break;
  	case UFS_ST_44BSD:
  		((__fs32 *)&tmp)[0] = usb3->fs_un2.fs_44.fs_qfmask[0];
  		((__fs32 *)&tmp)[1] = usb3->fs_un2.fs_44.fs_qfmask[1];
  		break;
  	}
  
  	return fs64_to_cpu(sb, tmp);
  }
  
  static inline u16
  ufs_get_de_namlen(struct super_block *sb, struct ufs_dir_entry *de)
  {
  	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
  		return fs16_to_cpu(sb, de->d_u.d_namlen);
  	else
  		return de->d_u.d_44.d_namlen; /* XXX this seems wrong */
  }
  
  static inline void
  ufs_set_de_namlen(struct super_block *sb, struct ufs_dir_entry *de, u16 value)
  {
  	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) == UFS_DE_OLD)
  		de->d_u.d_namlen = cpu_to_fs16(sb, value);
  	else
  		de->d_u.d_44.d_namlen = value; /* XXX this seems wrong */
  }
  
  static inline void
  ufs_set_de_type(struct super_block *sb, struct ufs_dir_entry *de, int mode)
  {
  	if ((UFS_SB(sb)->s_flags & UFS_DE_MASK) != UFS_DE_44BSD)
  		return;
  
  	/*
  	 * TODO turn this into a table lookup
  	 */
  	switch (mode & S_IFMT) {
  	case S_IFSOCK:
  		de->d_u.d_44.d_type = DT_SOCK;
  		break;
  	case S_IFLNK:
  		de->d_u.d_44.d_type = DT_LNK;
  		break;
  	case S_IFREG:
  		de->d_u.d_44.d_type = DT_REG;
  		break;
  	case S_IFBLK:
  		de->d_u.d_44.d_type = DT_BLK;
  		break;
  	case S_IFDIR:
  		de->d_u.d_44.d_type = DT_DIR;
  		break;
  	case S_IFCHR:
  		de->d_u.d_44.d_type = DT_CHR;
  		break;
  	case S_IFIFO:
  		de->d_u.d_44.d_type = DT_FIFO;
  		break;
  	default:
  		de->d_u.d_44.d_type = DT_UNKNOWN;
  	}
  }
  
  static inline u32
  ufs_get_inode_uid(struct super_block *sb, struct ufs_inode *inode)
  {
  	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
  	case UFS_UID_44BSD:
  		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_uid);
  	case UFS_UID_EFT:
  		if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
  			return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_uid);
  		/* Fall through */
  	default:
  		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_suid);
  	}
  }
  
  static inline void
  ufs_set_inode_uid(struct super_block *sb, struct ufs_inode *inode, u32 value)
  {
  	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
  	case UFS_UID_44BSD:
  		inode->ui_u3.ui_44.ui_uid = cpu_to_fs32(sb, value);
  		inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
  		break;
  	case UFS_UID_EFT:
  		inode->ui_u3.ui_sun.ui_uid = cpu_to_fs32(sb, value);
  		if (value > 0xFFFF)
  			value = 0xFFFF;
  		/* Fall through */
  	default:
  		inode->ui_u1.oldids.ui_suid = cpu_to_fs16(sb, value);
  		break;
  	}
  }
  
  static inline u32
  ufs_get_inode_gid(struct super_block *sb, struct ufs_inode *inode)
  {
  	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
  	case UFS_UID_44BSD:
  		return fs32_to_cpu(sb, inode->ui_u3.ui_44.ui_gid);
  	case UFS_UID_EFT:
  		if (inode->ui_u1.oldids.ui_suid == 0xFFFF)
  			return fs32_to_cpu(sb, inode->ui_u3.ui_sun.ui_gid);
  		/* Fall through */
  	default:
  		return fs16_to_cpu(sb, inode->ui_u1.oldids.ui_sgid);
  	}
  }
  
  static inline void
  ufs_set_inode_gid(struct super_block *sb, struct ufs_inode *inode, u32 value)
  {
  	switch (UFS_SB(sb)->s_flags & UFS_UID_MASK) {
  	case UFS_UID_44BSD:
  		inode->ui_u3.ui_44.ui_gid = cpu_to_fs32(sb, value);
  		inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
  		break;
  	case UFS_UID_EFT:
  		inode->ui_u3.ui_sun.ui_gid = cpu_to_fs32(sb, value);
  		if (value > 0xFFFF)
  			value = 0xFFFF;
  		/* Fall through */
  	default:
  		inode->ui_u1.oldids.ui_sgid =  cpu_to_fs16(sb, value);
  		break;
  	}
  }
  
  extern dev_t ufs_get_inode_dev(struct super_block *, struct ufs_inode_info *);
  extern void ufs_set_inode_dev(struct super_block *, struct ufs_inode_info *, dev_t);
  extern int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len);
  
  /*
   * These functions manipulate ufs buffers
   */
  #define ubh_bread(sb,fragment,size) _ubh_bread_(uspi,sb,fragment,size)  
  extern struct ufs_buffer_head * _ubh_bread_(struct ufs_sb_private_info *, struct super_block *, u64 , u64);
  extern struct ufs_buffer_head * ubh_bread_uspi(struct ufs_sb_private_info *, struct super_block *, u64, u64);
  extern void ubh_brelse (struct ufs_buffer_head *);
  extern void ubh_brelse_uspi (struct ufs_sb_private_info *);
  extern void ubh_mark_buffer_dirty (struct ufs_buffer_head *);
  extern void ubh_mark_buffer_uptodate (struct ufs_buffer_head *, int);
  extern void ubh_sync_block(struct ufs_buffer_head *);
  extern void ubh_bforget (struct ufs_buffer_head *);
  extern int  ubh_buffer_dirty (struct ufs_buffer_head *);
  #define ubh_ubhcpymem(mem,ubh,size) _ubh_ubhcpymem_(uspi,mem,ubh,size)
  extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struct ufs_buffer_head *, unsigned);
  #define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
  extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
  
  /* This functions works with cache pages*/
  extern struct page *ufs_get_locked_page(struct address_space *mapping,
  					pgoff_t index);
  static inline void ufs_put_locked_page(struct page *page)
  {
         unlock_page(page);
         put_page(page);
  }
  
  
  /*
   * macros and inline function to get important structures from ufs_sb_private_info
   */
  
  static inline void *get_usb_offset(struct ufs_sb_private_info *uspi,
  				   unsigned int offset)
  {
  	unsigned int index;
  	
  	index = offset >> uspi->s_fshift;
  	offset &= ~uspi->s_fmask;
  	return uspi->s_ubh.bh[index]->b_data + offset;
  }
  
  #define ubh_get_usb_first(uspi) \
  	((struct ufs_super_block_first *)get_usb_offset((uspi), 0))
  
  #define ubh_get_usb_second(uspi) \
  	((struct ufs_super_block_second *)get_usb_offset((uspi), UFS_SECTOR_SIZE))
  
  #define ubh_get_usb_third(uspi)	\
  	((struct ufs_super_block_third *)get_usb_offset((uspi), 2*UFS_SECTOR_SIZE))
  
  
  #define ubh_get_ucg(ubh) \
  	((struct ufs_cylinder_group *)((ubh)->bh[0]->b_data))
  
  
  /*
   * Extract byte from ufs_buffer_head
   * Extract the bits for a block from a map inside ufs_buffer_head
   */
  #define ubh_get_addr8(ubh,begin) \
  	((u8*)(ubh)->bh[(begin) >> uspi->s_fshift]->b_data + \
  	((begin) & ~uspi->s_fmask))
  
  #define ubh_get_addr16(ubh,begin) \
  	(((__fs16*)((ubh)->bh[(begin) >> (uspi->s_fshift-1)]->b_data)) + \
  	((begin) & ((uspi->fsize>>1) - 1)))
  
  #define ubh_get_addr32(ubh,begin) \
  	(((__fs32*)((ubh)->bh[(begin) >> (uspi->s_fshift-2)]->b_data)) + \
  	((begin) & ((uspi->s_fsize>>2) - 1)))
  
  #define ubh_get_addr64(ubh,begin) \
  	(((__fs64*)((ubh)->bh[(begin) >> (uspi->s_fshift-3)]->b_data)) + \
  	((begin) & ((uspi->s_fsize>>3) - 1)))
  
  #define ubh_get_addr ubh_get_addr8
  
  static inline void *ubh_get_data_ptr(struct ufs_sb_private_info *uspi,
  				     struct ufs_buffer_head *ubh,
  				     u64 blk)
  {
  	if (uspi->fs_magic == UFS2_MAGIC)
  		return ubh_get_addr64(ubh, blk);
  	else
  		return ubh_get_addr32(ubh, blk);
  }
  
  #define ubh_blkmap(ubh,begin,bit) \
  	((*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) >> ((bit) & 7)) & (0xff >> (UFS_MAXFRAG - uspi->s_fpb)))
  
  /*
   * Determine the number of available frags given a
   * percentage to hold in reserve.
   */
  static inline u64
  ufs_freespace(struct ufs_sb_private_info *uspi, int percentreserved)
  {
  	return ufs_blkstofrags(uspi->cs_total.cs_nbfree) +
  		uspi->cs_total.cs_nffree -
  		(uspi->s_dsize * (percentreserved) / 100);
  }
  
  /*
   * Macros to access cylinder group array structures
   */
  #define ubh_cg_blktot(ucpi,cylno) \
  	(*((__fs32*)ubh_get_addr(UCPI_UBH(ucpi), (ucpi)->c_btotoff + ((cylno) << 2))))
  
  #define ubh_cg_blks(ucpi,cylno,rpos) \
  	(*((__fs16*)ubh_get_addr(UCPI_UBH(ucpi), \
  	(ucpi)->c_boff + (((cylno) * uspi->s_nrpos + (rpos)) << 1 ))))
  
  /*
   * Bitmap operations
   * These functions work like classical bitmap operations.
   * The difference is that we don't have the whole bitmap
   * in one contiguous chunk of memory, but in several buffers.
   * The parameters of each function are super_block, ufs_buffer_head and
   * position of the beginning of the bitmap.
   */
  #define ubh_setbit(ubh,begin,bit) \
  	(*ubh_get_addr(ubh, (begin) + ((bit) >> 3)) |= (1 << ((bit) & 7)))
  
  #define ubh_clrbit(ubh,begin,bit) \
  	(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) &= ~(1 << ((bit) & 7)))
  
  #define ubh_isset(ubh,begin,bit) \
  	(*ubh_get_addr (ubh, (begin) + ((bit) >> 3)) & (1 << ((bit) & 7)))
  
  #define ubh_isclr(ubh,begin,bit) (!ubh_isset(ubh,begin,bit))
  
  #define ubh_find_first_zero_bit(ubh,begin,size) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,0)
  
  #define ubh_find_next_zero_bit(ubh,begin,size,offset) _ubh_find_next_zero_bit_(uspi,ubh,begin,size,offset)
  static inline unsigned _ubh_find_next_zero_bit_(
  	struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
  	unsigned begin, unsigned size, unsigned offset)
  {
  	unsigned base, count, pos;
  
  	size -= offset;
  	begin <<= 3;
  	offset += begin;
  	base = offset >> uspi->s_bpfshift;
  	offset &= uspi->s_bpfmask;
  	for (;;) {
  		count = min_t(unsigned int, size + offset, uspi->s_bpf);
  		size -= count - offset;
  		pos = find_next_zero_bit_le(ubh->bh[base]->b_data, count, offset);
  		if (pos < count || !size)
  			break;
  		base++;
  		offset = 0;
  	}
  	return (base << uspi->s_bpfshift) + pos - begin;
  } 	
  
  static inline unsigned find_last_zero_bit (unsigned char * bitmap,
  	unsigned size, unsigned offset)
  {
  	unsigned bit, i;
  	unsigned char * mapp;
  	unsigned char map;
  
  	mapp = bitmap + (size >> 3);
  	map = *mapp--;
  	bit = 1 << (size & 7);
  	for (i = size; i > offset; i--) {
  		if ((map & bit) == 0)
  			break;
  		if ((i & 7) != 0) {
  			bit >>= 1;
  		} else {
  			map = *mapp--;
  			bit = 1 << 7;
  		}
  	}
  	return i;
  }
  
  #define ubh_find_last_zero_bit(ubh,begin,size,offset) _ubh_find_last_zero_bit_(uspi,ubh,begin,size,offset)
  static inline unsigned _ubh_find_last_zero_bit_(
  	struct ufs_sb_private_info * uspi, struct ufs_buffer_head * ubh,
  	unsigned begin, unsigned start, unsigned end)
  {
  	unsigned base, count, pos, size;
  
  	size = start - end;
  	begin <<= 3;
  	start += begin;
  	base = start >> uspi->s_bpfshift;
  	start &= uspi->s_bpfmask;
  	for (;;) {
  		count = min_t(unsigned int,
  			    size + (uspi->s_bpf - start), uspi->s_bpf)
  			- (uspi->s_bpf - start);
  		size -= count;
  		pos = find_last_zero_bit (ubh->bh[base]->b_data,
  			start, start - count);
  		if (pos > start - count || !size)
  			break;
  		base--;
  		start = uspi->s_bpf;
  	}
  	return (base << uspi->s_bpfshift) + pos - begin;
  } 	
  
  #define ubh_isblockclear(ubh,begin,block) (!_ubh_isblockset_(uspi,ubh,begin,block))
  
  #define ubh_isblockset(ubh,begin,block) _ubh_isblockset_(uspi,ubh,begin,block)
  static inline int _ubh_isblockset_(struct ufs_sb_private_info * uspi,
  	struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
  {
  	switch (uspi->s_fpb) {
  	case 8:
  	    	return (*ubh_get_addr (ubh, begin + block) == 0xff);
  	case 4:
  		return (*ubh_get_addr (ubh, begin + (block >> 1)) == (0x0f << ((block & 0x01) << 2)));
  	case 2:
  		return (*ubh_get_addr (ubh, begin + (block >> 2)) == (0x03 << ((block & 0x03) << 1)));
  	case 1:
  		return (*ubh_get_addr (ubh, begin + (block >> 3)) == (0x01 << (block & 0x07)));
  	}
  	return 0;	
  }
  
  #define ubh_clrblock(ubh,begin,block) _ubh_clrblock_(uspi,ubh,begin,block)
  static inline void _ubh_clrblock_(struct ufs_sb_private_info * uspi,
  	struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
  {
  	switch (uspi->s_fpb) {
  	case 8:
  	    	*ubh_get_addr (ubh, begin + block) = 0x00;
  	    	return; 
  	case 4:
  		*ubh_get_addr (ubh, begin + (block >> 1)) &= ~(0x0f << ((block & 0x01) << 2));
  		return;
  	case 2:
  		*ubh_get_addr (ubh, begin + (block >> 2)) &= ~(0x03 << ((block & 0x03) << 1));
  		return;
  	case 1:
  		*ubh_get_addr (ubh, begin + (block >> 3)) &= ~(0x01 << ((block & 0x07)));
  		return;
  	}
  }
  
  #define ubh_setblock(ubh,begin,block) _ubh_setblock_(uspi,ubh,begin,block)
  static inline void _ubh_setblock_(struct ufs_sb_private_info * uspi,
  	struct ufs_buffer_head * ubh, unsigned begin, unsigned block)
  {
  	switch (uspi->s_fpb) {
  	case 8:
  	    	*ubh_get_addr(ubh, begin + block) = 0xff;
  	    	return;
  	case 4:
  		*ubh_get_addr(ubh, begin + (block >> 1)) |= (0x0f << ((block & 0x01) << 2));
  		return;
  	case 2:
  		*ubh_get_addr(ubh, begin + (block >> 2)) |= (0x03 << ((block & 0x03) << 1));
  		return;
  	case 1:
  		*ubh_get_addr(ubh, begin + (block >> 3)) |= (0x01 << ((block & 0x07)));
  		return;
  	}
  }
  
  static inline void ufs_fragacct (struct super_block * sb, unsigned blockmap,
  	__fs32 * fraglist, int cnt)
  {
  	struct ufs_sb_private_info * uspi;
  	unsigned fragsize, pos;
  	
  	uspi = UFS_SB(sb)->s_uspi;
  	
  	fragsize = 0;
  	for (pos = 0; pos < uspi->s_fpb; pos++) {
  		if (blockmap & (1 << pos)) {
  			fragsize++;
  		}
  		else if (fragsize > 0) {
  			fs32_add(sb, &fraglist[fragsize], cnt);
  			fragsize = 0;
  		}
  	}
  	if (fragsize > 0 && fragsize < uspi->s_fpb)
  		fs32_add(sb, &fraglist[fragsize], cnt);
  }
  
  static inline void *ufs_get_direct_data_ptr(struct ufs_sb_private_info *uspi,
  					    struct ufs_inode_info *ufsi,
  					    unsigned blk)
  {
  	BUG_ON(blk > UFS_TIND_BLOCK);
  	return uspi->fs_magic == UFS2_MAGIC ?
  		(void *)&ufsi->i_u1.u2_i_data[blk] :
  		(void *)&ufsi->i_u1.i_data[blk];
  }
  
  static inline u64 ufs_data_ptr_to_cpu(struct super_block *sb, void *p)
  {
  	return UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC ?
  		fs64_to_cpu(sb, *(__fs64 *)p) :
  		fs32_to_cpu(sb, *(__fs32 *)p);
  }
  
  static inline void ufs_cpu_to_data_ptr(struct super_block *sb, void *p, u64 val)
  {
  	if (UFS_SB(sb)->s_uspi->fs_magic == UFS2_MAGIC)
  		*(__fs64 *)p = cpu_to_fs64(sb, val);
  	else
  		*(__fs32 *)p = cpu_to_fs32(sb, val);
  }
  
  static inline void ufs_data_ptr_clear(struct ufs_sb_private_info *uspi,
  				      void *p)
  {
  	if (uspi->fs_magic == UFS2_MAGIC)
  		*(__fs64 *)p = 0;
  	else
  		*(__fs32 *)p = 0;
  }
  
  static inline int ufs_is_data_ptr_zero(struct ufs_sb_private_info *uspi,
  				       void *p)
  {
  	if (uspi->fs_magic == UFS2_MAGIC)
  		return *(__fs64 *)p == 0;
  	else
  		return *(__fs32 *)p == 0;
  }
  